Uman State Pedagogical University

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Uman', Ukraine
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Tytar V.,Schmalhausen Institute of Zoology NAS of Ukraine | Mezhzherin S.,Schmalhausen Institute of Zoology NAS of Ukraine | Sobolenko L.,Uman State Pedagogical University
Vestnik Zoologii | Year: 2015

Maximum entropy niche modeling was employed as a tool to assess potential habitat suitability for 13 amphibian species and to map their potential distribution in the Western Podillya (Ukraine). Th e predictor variables used were of climate, topography and human impact (assessed by the Human Footprint). Th e "mean temperature of coldest quarter" and "isothermality" were two of the most important factors in predicting habitat suitability and distribution. Another profound contribution has been displayed by the Human Footprint, meaning that human infrastructure may benefi t amphibians, a phenomenon that perhaps is much more widespread than thought. Areas have been distinguished that in the fi rst place should be of interest to nature conservationists targeting amphibians (exemplifi ed by Bombina variegata) and a map summarizing species richness was produced. © P. E. Goldin et al. 2015.


Mitiai O.,Uman State Pedagogical University | Lagodiienko V.,Odessa National Academy of Food Technologies | Safonov V.,Odesa National Economic University
Economic Annals-XXI | Year: 2015

Introduction. The problem of economic mechanisms formation for the sustainable development of the agricultural sector in the context of rational use and restoration of natural resources takes an important place in agricultural economic studies. Purpose. To define the essence of sustainable development in the agricultural sector and justify its interim mechanisms. Results. The agrarian enterprises' sustainable development has been grounded through the mobilisation of their internal resources to create a rational structure of production. The mentioned structure would mitigate adverse impacts and obtain minimal deviations from the current trends of development. The interrelation between the sustainable development of the agricultural sector and the competitiveness of enterpri ses has been set. The basic criteria and a structural model of the agricultural sector sustainable development have been formed. It includes such an innovation as corporate social responsibi lity of agricultural enterprises aimed at safe ope ration and competitiveness. Conclusions. The interrelation between the sustainable development of the agricultural sector and the competitiveness of agricultural enterprises is the main factor of sustainable development which may improve sustainability of the environment. It provides a system of food quality standards creation. Thus, enterprises producing uncompetitive products by using outdated processes will not succeed in the long run perspective.


Roik O.S.,Taras Shevchenko National University | Kazimirov V.P.,Taras Shevchenko National University | Sokolskii V.E.,Taras Shevchenko National University | Galushko S.M.,Uman State Pedagogical University
Journal of Non-Crystalline Solids | Year: 2013

The short-range order in binary and ternary liquid alloys of aluminum with 3d-transition metals (TM) was studied by the X-ray diffraction method and Reverse Monte Carlo simulations. The causes of the presence of the prepeak and asymmetric shape of the second peak on the experimental total structure factors were discussed. The effect of the transition metal atom type on the short-range order of Al-based liquid alloys was demonstrated. © 2013 Elsevier B.V.


Dudyk .V.,Uman State Pedagogical University | Dikhtyarenko Y.V.,Uman State Pedagogical University | Dyakon V..,European University at Kiev
Materials Science | Year: 2014

We present the solution of the problem of process zone which develops under the condition of plain deformation from the tip of an interface crack that coincides with the corner point of the interface of two different materials. The process zone is modeled by the line of discontinuity of tangential displacements on the interface and by the lateral line of discontinuity of the normal displacements. The equation for finding the lengths of both discontinuity lines and the expression for the crack opening displacement are obtained. We study the influence of plasticity of the material of the joint on the direction and conditions of crack start. © 2014, Springer Science+Business Media New York.


Kaminsky A.A.,Ukrainian Academy of Sciences | Kipnis L.A.,Uman State Pedagogical University | Polishchuk T.V.,Uman State Pedagogical University
International Applied Mechanics | Year: 2012

A symmetric problem of elasticity is solved to determine the initial fracture process zone at the corner point of a V-shaped interface in a piecewise-homogeneous isotropic body. The interface is a thin elastic layer joining two isotropic elastic materials. The initial fracture process zone is modeled by lines of discontinuity of normal displacement located at the interface. The exact solution of the problem of linear elasticity is found with the Wiener-Hopf method and then used to determine the length of the fracture process zone. The stress state near the corner point is examined © 2012 Springer Science+Business Media New York.


Dudyk M.V.,Uman State Pedagogical University | Dikhtyarenko Yu.V.,Uman State Pedagogical University
Materials Science | Year: 2012

We present the solution of the problem of initial process zone under the conditions of plane deformation in the vicinity of an angular point on the interface of two dissimilar elastic materials playing the role of the origin of an interface crack. We study the dependences of orientation, length, and crack opening displacement on the external load, opening angle of the interface, and the elastic parameters of the joined materials. The conditions of crack initiation are analyzed by using the deformation criterion. © 2012 Springer Science+Business Media, Inc.


Tytar V.,Ukrainian Academy of Sciences | Sobolenko L.,Uman State Pedagogical University | Nekrasova O.,Ukrainian Academy of Sciences | Mezhzherin S.,Ukrainian Academy of Sciences
Vestnik Zoologii | Year: 2015

Using Ecological Niche Modeling for Biodiversity Conservation Guidance in the Western Podillya (Ukraine): Reptiles. Tytar, V., Sobolenko, L., Nekrasova, O. Mezhzherin, S.-Maximum entropy niche modeling was employed as a tool to assess potential habitat suitability for 10 reptile species and to map their potential distribution in the Western Podillya (Ukraine). We used climate, topography and human impact (assessed by the Human Footprint) as predictor variables. "Isothermality", "temperature seasonality" and the "mean temperature of coldest month" were three most important factors in predicting habitat suitability and distribution. A profound contribution to the modeling has been displayed by the Human Footprint, meaning that human infrastructure may benefit reptile species. Areas have been distinguished that in the first place should be of interest to biodiversity conservationists targeting reptiles and maps summarizing predicted habitat suitability and species richness were produced for guiding conservation efforts. © 2016 by V. Tytar 2016.


Dudyk M.V.,Uman State Pedagogical University | Dikhtyarenko Y.V.,Uman State Pedagogical University
Materials Science | Year: 2015

By using the Wiener–Hopf method, within the framework of the “trident” model, we compute a small-scale plastic zone formed under conditions of plane deformation at the corner point of the interface of two different elastoplastic materials in the presence of a mode I crack originating from this point. The indicated zone is modeled by two symmetric lateral lines of discontinuities of tangential displacements and the line of discontinuity of normal-displacement on the continuation of the crack. We deduce analytic expressions for the evaluation of the sizes of the plastic zone and crack opening displacements. On the basis of numerical investigations, we analyze the dependences of parameters of this zone on the opening angle of the interface and the elastic characteristics of the materials. © 2015 Springer Science+Business Media New York


Kaminsky A.A.,Ukrainian Academy of Sciences | Kipnis L.A.,Uman State Pedagogical University | Khazin G.A.,Uman State Pedagogical University
International Applied Mechanics | Year: 2010

The Wiener-Hopf method is used to find the exact solution to the static symmetric plane problem of elasticity for a homogeneous isotropic plate with a finite-length crack emerging from the point of intersection of two semi-infinite straight slip (dislocation) lines. An expression for the crack-tip stress intensity factor is derived. Crack initiation is described by the Cottrell mechanism. The equilibrium of the crack is analyzed for stability. ©2010 Springer Science+Business Media, Inc.


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